Hi, I run my parallelized code which is similar to step-18 on HPC. When I
run it in multiple mpi processes on a single node. It can give me a good
solution. However, when I run it on multiple nodes of HPC and each node has
one mpi process, it reported an error as follows. I checked the l2 norm of
the assembled system matrix which is not equal to zero. So, I really want
to know what leads to the error? Thank you very much.
Exception on processing:
--------------------------------------------------------
An error occurred in line <148> of file
</scratch/07506/xs260/dealii-src/source/lac/petsc_solver.cc> in function
void dealii::PETScWrappers::SolverBase::solve(const
dealii::PETScWrappers::MatrixBase &, dealii::PETScWrappers::VectorBas$
The violated condition was:
false
Additional information:
Iterative method reported convergence failure in step 4294967295. The
residual in the last step was nan.
This error message can indicate that you have simply not allowed a
sufficiently large number of iterations for your iterative$
The other situation where this error may occur is when your matrix is not
invertible (e.g., your matrix has a null-space), or$
--------------------------------------------------------
Aborting!
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